用el-upload和axios上传文件，没有进度条

Question

我已经使用 ui 元素和 axios 创建了文件上传器。但是没有进度条显示上传文件的进度。

<template>
  <div class="app-container">
    <h1>My Cards</h1>
    <el-button type="primary" icon="el-icon-upload" @click="uploadDialogVisible = true">Import CSV</el-button>
    <Pagination
      :total="totalCards"
      layout="total, prev, pager, next"
      :limit="10"
      :page.sync="currentPage"
      @pagination="loadNewPage"
    ></Pagination>
    <el-table v-loading="loadingCardsList" :data="cards" stripe style="width: 100%">
      <el-table-column prop="name" sortable label="Product Name"></el-table-column>
      <el-table-column prop="description" label="Description" width="200px"></el-table-column>
      <el-table-column prop="price" label="Price"></el-table-column>
      <el-table-column prop="cardcategory" sortable label="Category"></el-table-column>
      <el-table-column label="Operations" width="300px">
        <template slot-scope="scope">
          <el-button size="mini" type="primary" @click="handleView(scope.$index, scope.row)">View</el-button>
          <el-button size="mini" @click="handleEdit(scope.$index, scope.row)">Edit</el-button>
          <el-button size="mini" type="danger" @click="handleDelete(scope.$index, scope.row)">Delete</el-button>
        </template>
      </el-table-column>
    </el-table>
    <el-dialog :visible.sync="viewCard" width="30%">
      <el-card class="box-card">
        <h1>{{currentViewedCard.name}}</h1>
        <p>{{currentViewedCard.description}}</p>
        <p>{{currentViewedCard.price}}</p>
        <el-tag>{{currentViewedCard.cardcategory}}</el-tag>
      </el-card>
    </el-dialog>
    <el-dialog
      title="Import Data from CSV"
      :visible.sync="uploadDialogVisible"
      :before-close="handleUploadDialogClose"
    >
      <div>
        <el-upload
          class="upload-demo"
          action=""
          :on-change="handleUploadChange"
          :before-upload="handleBeforeUpload"
          accept=".csv"
          :file-list="fileList"
          ref="upload"
          :auto-upload="false"
          :on-progress="handleProgress"
          :on-success="handleSuccess"
        >
          <el-button slot="trigger" size="small" type="primary">Click to upload</el-button>
          <el-button
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload"
          >upload to server</el-button>
          <div slot="tip" class="el-upload__tip">jpg/png files with a size less than 500kb</div>
        </el-upload>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import Resource from '@/api/resource';
import Pagination from '@/components/Pagination/index.vue';
const cardcategoryResource = new Resource('cardcategories');
const cardResource = new Resource('cards');
import axios from 'axios';

export default {
  name: 'Cards',
  components: {
    Pagination,
  },
  data() {
    return {
      cards: [],
      categories: [],
      currentPage: '',
      totalCards: '',
      loadingCardsList: true,
      currentViewedCard: '',
      viewCard: false,
      uploadDialogVisible: false,
      fileList: [],
    };
  },
  created() {
    this.getCardCategories();
    this.getCardList({ page: 1 });
  },
  methods: {
    submitUpload() {
      const formData = new FormData();
      formData.append('csvfile', this.fileList[0].raw);
      axios
        .post('http://127.0.0.1:8000/api/cards/csvupload', formData)
        .then(() => {
          this.$message.success('Success');
          this.getCardList({ page: 1 });
          // this.fileList = []; //Temporary depicts that the file has been uploaded
        })
        .catch(() => {
          alert('error');
        });
    },
    handleProgress(ev, file, fileLIst) {
      file.raw['status'] = "uploading";
    },
    handleSuccess(res, file, fileLIst) {
      file.raw['status'] = "success";
    },
    handleUploadChange(file, fileList) {
      this.fileList = fileList.slice(-1);
    },
    handleBeforeUpload(file) {
      const allowedCsvMime = [
        'text/csv',
        'text/plain',
        'application/csv',
        'text/comma-separated-values',
        'application/excel',
        'application/vnd.ms-excel',
        'application/vnd.msexcel',
        'text/anytext',
        'application/octet-stream',
        'application/txt',
      ];
      if (allowedCsvMime.includes(file.type)) {
        return true;
      } else {
        this.$message.error(
          'You can only upload CSV files. No other file types are allowed'
        );
        this.fileList.pop(file);
      }
    },
    async getCardList(query) {
      this.loadingCardsList = true;
      const data = await cardResource.list(query);
      this.cards = data.data;
      for (const card of this.cards) {
        card['cardcategory'] = this.getCategoryName(card.cardCategory_id);
      }
      console.log(this.cards);
      this.totalCards = data.total;
      this.loadingCardsList = false;
    },
    async getCardCategories() {
      this.categories = await cardcategoryResource.list({});
      console.log(this.categories);
    },
    loadNewPage(val) {
      this.getCardList({ page: val.page });
    },
    getCategoryName(id) {
      return this.categories[id - 1].name;
    },
    handleView(index, info) {
      this.viewCard = true;
      this.currentViewedCard = info;
    },
    handleEdit(index, info) {
      this.$router.push('/cards/edit/' + info.id);
    },
    closeDialog() {
      this.viewProduct = false;
      this.currentProductInfo = null;
    },
    handleDelete(index, info) {
      cardResource.destroy(info.id).then(response => {
        this.$message({
          message: 'Card Deleted Successfully',
          type: 'success',
          duration: 3000,
        });
        this.getCardList({ page: this.currentPage });
      });
    },
  },
};
</script>

<style lang="scss" scoped>
</style>

在这里，我使用了 el-upload 组件上传文件，并使用 axios wia btn 单击提交了文件。文件已上传，但上传成功后无法看到进度条和绿色成功图标。

Answer 1

提供 onUploadProgress 作为 axios.post 中的参数。创建一个进度条并为其提供 uploadPercentage 的值。例子.

axios.post( 'http://127.0.0.1:8000/api/cards/csvupload',
   formData,
   {
     headers: {
         'Content-Type': 'multipart/form-data'
     },
     onUploadProgress: function( progressEvent ) {
       this.uploadPercentage = parseInt( Math.round( ( progressEvent.loaded * 100 ) / progressEvent.total ) );
     }.bind(this)
   }
 ).then(function(){
   console.log('SUCCESS!!');
 })
 .catch(function(){
   console.log('FAILURE!!');
 });
},```

用el-upload和axios上传文件，没有进度条

File upload with el-upload and axios, no progress bar

laravel

vue.js

axios

element-ui